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        <title>Document</title>
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            *{
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            header{
                width: 962px;
                height: 95px;
                background: lime;
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            nav{
                height: 68px;
                background:url('images/nav.png') repeat-x
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            main{
                /* text-align: center; */
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            main img{
                /* 行内块和父级默认有留白 可以把行内块转化为快级标签解决该问题*/
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                /* 快级标签居中 */
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            header h1{
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                margin-top: 20px;
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            header p{
                float: right;
                margin-top: 26px;
                margin-right: 10px;
                position:relative;
            }
            header p img{
                position: absolute;
                right: 10px;
                top: 5px;
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            nav ul{
                width: 962px;
                margin: 0px auto;
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            nav li{
                float:left;
                margin-left: 100px;
                margin-top: 20px;
            }
            nav img{
                position:relative;
                top: -2px;
                margin-left: 10px;
            }
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                text-align: center;
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                padding: 60px 0px 100px;
                border-bottom: 1px solid #000;
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            footer h2{
                float: left;
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            footer dl{
                float: left;
                width: 183px;
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    </head>
    <body>
       <header>
           <h1>
               <img src="images/logo_header.png" alt="">
           </h1>
           <p>简</p>
           <p>阿里巴巴集团相关平台</p>
           <p>
               <img src="images/search.png" alt="">
               <input type="text">
           </p>
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               <li>关于我们<img src="images/down1.png
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               <h2>
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               <dl>
                   <dt>关于我们</dt>
                   <dd>公司简介</dd>
                   <dd>业务范畴</dd>
                   <dd>历史及里程碑</dd>
                   <dd>领导团体</dd>
                   <dd>文化和价值观</dd>
                   <dd>可持续发展</dd>
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                <dt>关于我们</dt>
                <dd>公司简介</dd>
                <dd>业务范畴</dd>
                <dd>历史及里程碑</dd>
                <dd>领导团体</dd>
                <dd>文化和价值观</dd>
                <dd>可持续发展</dd>
            </dl>
            <dl>
                <dt>关于我们</dt>
                <dd>公司简介</dd>
                <dd>业务范畴</dd>
                <dd>历史及里程碑</dd>
                <dd>领导团体</dd>
                <dd>文化和价值观</dd>
                <dd>可持续发展</dd>
            </dl>
            <dl>
                <dt>关于我们</dt>
                <dd>公司简介</dd>
                <dd>业务范畴</dd>
                <dd>历史及里程碑</dd>
                <dd>领导团体</dd>
                <dd>文化和价值观</dd>
                <dd>可持续发展</dd>
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